romfs: use different way to generate fsid for BLOCK or MTD

Commit 8a59f5d25265 ("fs/romfs: return f_fsid for statfs(2)") generates
a 64bit id from sb->s_bdev->bd_dev.  This is only correct when romfs is
defined with CONFIG_ROMFS_ON_BLOCK.  If romfs is only defined with
CONFIG_ROMFS_ON_MTD, sb->s_bdev is NULL, referencing sb->s_bdev->bd_dev
will triger an oops.

Richard Weinberger points out that when CONFIG_ROMFS_BACKED_BY_BOTH=y,
both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD are defined.
Therefore when calling huge_encode_dev() to generate a 64bit id, I use
the follow order to choose parameter,

- CONFIG_ROMFS_ON_BLOCK defined
  use sb->s_bdev->bd_dev
- CONFIG_ROMFS_ON_BLOCK undefined and CONFIG_ROMFS_ON_MTD defined
  use sb->s_dev when,
- both CONFIG_ROMFS_ON_BLOCK and CONFIG_ROMFS_ON_MTD undefined
  leave id as 0

When CONFIG_ROMFS_ON_MTD is defined and sb->s_mtd is not NULL, sb->s_dev
is set to a device ID generated by MTD_BLOCK_MAJOR and mtd index,
otherwise sb->s_dev is 0.

This is a try-best effort to generate a uniq file system ID, if all the
above conditions are not meet, f_fsid of this romfs instance will be 0.
Generally only one romfs can be built on single MTD block device, this
method is enough to identify multiple romfs instances in a computer.

Link: http://lkml.kernel.org/r/1482928596-115155-1-git-send-email-colyli@suse.de
Signed-off-by: Coly Li <colyli@suse.de>
Reported-by: Nong Li <nongli1031@gmail.com>
Tested-by: Nong Li <nongli1031@gmail.com>
Cc: Richard Weinberger <richard.weinberger@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/romfs/super.c b/fs/romfs/super.c
index d0f8a38dfafacd8f3d524d1ff69ae8f621eea278..0186fe6d39f3b4d2e77497d4d34a7691204ae9fa 100644 (file)
--- a/fs/romfs/super.c
+++ b/fs/romfs/super.c
@@ -74,6 +74,7 @@
 #include <linux/highmem.h>
 #include <linux/pagemap.h>
 #include <linux/uaccess.h>
+#include <linux/major.h>
 #include "internal.h"
 
 static struct kmem_cache *romfs_inode_cachep;
@@ -416,7 +417,22 @@ static void romfs_destroy_inode(struct inode *inode)
 static int romfs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
        struct super_block *sb = dentry->d_sb;
-       u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+       u64 id = 0;
+
+       /* When calling huge_encode_dev(),
+        * use sb->s_bdev->bd_dev when,
+        *   - CONFIG_ROMFS_ON_BLOCK defined
+        * use sb->s_dev when,
+        *   - CONFIG_ROMFS_ON_BLOCK undefined and
+        *   - CONFIG_ROMFS_ON_MTD defined
+        * leave id as 0 when,
+        *   - CONFIG_ROMFS_ON_BLOCK undefined and
+        *   - CONFIG_ROMFS_ON_MTD undefined
+        */
+       if (sb->s_bdev)
+               id = huge_encode_dev(sb->s_bdev->bd_dev);
+       else if (sb->s_dev)
+               id = huge_encode_dev(sb->s_dev);
 
        buf->f_type = ROMFS_MAGIC;
        buf->f_namelen = ROMFS_MAXFN;
@@ -489,6 +505,11 @@ static int romfs_fill_super(struct super_block *sb, void *data, int silent)
        sb->s_flags |= MS_RDONLY | MS_NOATIME;
        sb->s_op = &romfs_super_ops;
 
+#ifdef CONFIG_ROMFS_ON_MTD
+       /* Use same dev ID from the underlying mtdblock device */
+       if (sb->s_mtd)
+               sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, sb->s_mtd->index);
+#endif
        /* read the image superblock and check it */
        rsb = kmalloc(512, GFP_KERNEL);
        if (!rsb)